Definition of estriol in English:

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Pronunciation: /ˈestrīˌôl/ Pronunciation: /- ˌäl/ Pronunciation: /eˈstrīôl/ Pronunciation: /eˈstrīäl/
(also oestriol)


An estrogen that is one of the metabolic products of estradiol.
Example sentences
  • Even though the ovaries cease producing estradiol, estriol continues to be made by the adrenal glands and in fat cells.
  • Natural estrogen can also easily be divided into the three types of estrogen: estradiol, estrone, and estriol.
  • I assume that you're taking an oral dose of estriol or some combination of estriol, estrone, and estradiol.


1930s: from estrane (the parent molecule of most estrogens) + tri- + -ol.

For editors and proofreaders

Syllabification: es·tri·ol

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